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Question
The electro negativities (according to Pauling) of the elements in period 3 of the periodic table are as follows.
The elements are arranged in alphabetical order:
Al Cl Mg Na P S Si
1.5 3.0 1.2 0.9 2.1 2.5 1.8
(i) Arrange the elements in the order in which they occur in the periodic table from left to right.
(The group 1 elements first, followed by the group 2 element and so on, up to group 7)
(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a ______ (lower/higher) electro negativity than sodium and the element above chlorine which would be expected to have a ______ (lower / higher) ionization potential than chlorine.
(b) On moving from left to right in a given period, the number of shells ______ (remains the same / decreases/ increases).
(c) On moving down a group, the number of valence electrons ______ (remains the same / increases/ decreases).
Solution
(i) Na Mg Al Si P S Cl.
(ii) (a) lower, higher.
(b) remains the same.
(c) remains the same.
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Among the elements given below, the element with the least electronegativity is:
Arrange the following as per the instruction given in the bracket
F,Cl,Br (Increasing electronegativity)
The electronegativities (according to Pauling) of the elements in period 3 of the periodic table are as follows with elements arranged in alphabetical order:
| Al | Cl | Mg | Na | P | S | Si |
| 1.5 | 3.0 | 1.2 | 0.9 | 2.1 | 2.5 | 1.8 |
Arrange the elements in the order in which they occur in the periodic table from left to right.
(The group 1 element first, followed by the group 2 element and so on, up to group 7).
The element below sodium in the same group would be expected to have a ______ (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ______ (lower/higher) ionization potential than chlorine.
Answer the following question using the data given below:
- Assertion: The nature of bond in HF molecule is ionic
- Reason: The electronegativity difference between H and F is 1.9.
In the table below, H does not represent hydrogen. Some elements are given in their own symbol and position in the periodic table while others are shown with a letter.
| IA | IIA | IIIA | IVA | VA | VIA | VIIA | O |
| 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Li | D | O | J | Ne | |||
| A | Mg | E | Si | H | K | ||
| A | C | F | G | L |
Select from the table.
- Which is most electronegative.
- How many valence electrons are present in G.
- Write the formula of the compound between B and H.
- In the compound between F and J what type of bond will be formed.
- Draw the electron dot structure for the compound formed between C and K.
Electronegativity across the period ______.
